Abstract: Huali Jiayuan Phase II project is located in Caofeidian University Town,Tangshan City, in a newly deposited soft soil area.The original design of the foundation pit support of this project adopted the method of inserting steel sheet piles in the mixing piles.The sidewalls became unstable during the excavation of the foundation pit, which failed to achieve the desired support effect.According to the actual situation of the site,all parties gathered opinions to determine the construction plan supplemented by internal support.The information construction method was adopted in the construction,guided by the design plan,the construction plan was adjusted in time according to the site conditions,and the unfavorable situation was remedied in time,and the fi nal support work met the construction requirements.